A simple and effective locust extermination device. A flat pan was filled with coal tar and dragged over the surface of a locust infested field. Locusts would panic and jump into the pan, fall into the tar, and die.
Report of the Commissioner of Agriculture for the year 1877 (Washington, District of Columbia: Government Printing Office, 1878) Plate VIII, after page 264
Courtesy the private collection of Roy Winkelman